CN100485078C - Pipe for petroleum product, gas product and product pipelines, and method for the production thereof - Google Patents

Abstract

The invention relates to metallurgy, in particular to producing welded pipes for petrol and gas product pipelines and for other similar constructions (tanks and pressure vessels) used in difficult geological and climatic conditions in the presence of aggressive corrosion media. The inventive pipe for petrol and gas product pipelines is made of a steel hot-rolled sheet, wherein said steel is produced on the base of original or pure charging materials and comprises carbon, manganese, silicon, chromium, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, antimony, tin, arsenic, iron and molybdenum with the following component ratio: 0.02-011 mass % carbon, 0.10-1.80 mass % manganese, 0.06-0.60 mass % silicon, 0.005-0.30 mass % chromium, 0.005-1.0 mass % nickel, 0.01-0.12 mass % vanadium, 0.02-0.10 mass % niobium, 0.01-0.04 mass % titanium, 0.01-0.05 mass % aluminium, 0.0005-0.008 mass % calcium, 0.0005-0.008 mass % sulphur, 0.001-0.012 mass % phosphorus, 0.001-0.012 mass % nitrogen, 0.005-0.25 mass % copper, 0.0001-0.005 mass % antimony, 0.0001-0.007 mass % tin, 0.0001-0.008 mass % arsenic, equal or less than 0.5 mass % molybdenum, the rest being iron. The total nickel and manganese content depends on a molybdenum and phosphorus concentration expressed in mass % by the equation (I). The method for producing the inventive pipe consists in producing a steel having above mentioned composition, in treating in a ladle, casting, hot rolling, shaping and welding, wherein hot rolling is carried out on reversing and continuous mills and associated with a subsequent controllable accelerated cooling.

Description

The pipe and the manufacture method thereof that are used for petroleum products, gas product and product conduit

Technical field

The present invention relates to metallurgy, particularly be used for petroleum pipe line, natural gas line, product conduit and under disadvantageous geography and weather condition and erosion corrosion liquid can safety operation the manufacturing of welded tube of other similar designs (jar and pressurized vessel).

Background technology

Pipe and manufacture method thereof are disclosed (referring to No. 2180691 patent of the disclosed Russian Federation on March 20th, 2002, C21D9/08).It comprises steel-making, ladle processing, steel cast, hot rolling (a plurality of pressure rolling passages with predetermined deformation ratio), mold casting forming and welding.Steel form its component ratio following (weight %) by fused raw material casting initial or that purify:

Carbon: 0.03～0.11

Manganese: 0.9～1.8

Silicon: 0.06～0.6

Chromium: 0.005～0.30

Nickel: 0.005～0.3

Vanadium: 0.02～0.12

Niobium: 0.03～0.1

Titanium: 0.01～0.04

Aluminium: 0.01～0.055

Calcium: 0.001～0.005

Sulphur: 0.0005～0.008

Phosphorus: 0.0005～0.010

Nitrogen: 0.001～0.012

Copper: 0.005～0.25

Antimony: 0.0001～0.005

Tin: 0.0001～0.007

Arsenic: 0.0001～0.008

Iron: remainder

Under this ratio, the content of carbon, nitrogen, copper, phosphorus, antimony, tin and arsenic should be as follows:

C+10N<0.14

10P+Cu<0.14

2P+Sn+Sb+As<0.035

During hot rolling, the deformation ratio of each pressure rolling passage should be previous 1/1.25th～2.5, and should be at T _Bgn-T _EndFinish in＜200 the temperature range, wherein T _BgnAnd T _EndThe temperature that begins and finish for hot rolling correspondingly.

Lack the cooling of quick control owing to the manufacture method of the pipe of making by hot rolled steel sheet, then can in the manufacturing of double-strength pipe (K60 level and higher), cause very big restriction, particularly steel-sheet thickness surpasses 12 millimeters situation because important like this performance for example shock strength, plasticity, weldability, resistance to cracking and the erosion resistance of sub-zero temperature will reduce.This is because fast cooling (directly not setting forth in this invention) can be able to equilibrium by reduction temperature to 700 when hot rolling finishes ℃～750 ℃, and increase that can be by carbon and manganese content is (in order to provide required 60 kilograms/millimeter ²Level or higher strength characteristics) be able to equilibrium.These two kinds of methods can both provide required intensity, but it causes the relatively poor characteristic of relevant shock strength, weldability and erosion resistance.

Summary of the invention

The object of the present invention is to provide the required strength characteristics in the pipe made by the steel sheet that is up to 50 mm thick and other products (to be higher than 620 kilograms/millimeter ²Breaking tenacity) with the over-all properties of high-ductility, ductility, resistance to cracking and erosion resistance.

Say that technically obtaining required result is that described steel have following component proportions (weight %) because being used for the pipe of oil and natural gas pipeline is to make by the steel that fused raw material casting initial or that purify forms:

Carbon: 0.02～0.11

Manganese: 0.10～1.8

Silicon: 0.06～0.6

Chromium: 0.005～0.30

Nickel: 0.005～1.0

Vanadium: 0.01～0.12

Niobium: 0.02～0.1

Titanium: 0.01～0.04

Aluminium: 0.01～0.05

Calcium: 0.0005～0.008

Sulphur: 0.0005～0.008

Phosphorus: 0.001～0.012

Nitrogen: 0.001～0.012

Copper: 0.005～0.25

Antimony: 0.0001～0.005

Tin: 0.0001～0.007

Arsenic: 0.0001～0.008

Molybdenum: be no more than 0.5

Iron: remainder

In this case, the content of the total content of nickel and manganese and molybdenum and phosphorus (weight, the inequality below relation %) satisfies:

$\frac{\mathrm{Ni}+\mathrm{Mn}}{1+\mathrm{Mo}}\&CenterDot;P<0.03$

In addition, required result also can obtain by the method for making aforementioned tube, and described method comprises the welding that steel, ladle processing, hot rolling, mold casting forming and pipe with mentioned component ratio are made in refining.In the case, hot rolling is implemented on reversing mill or continuous rolling mill, carries out quick controlled chilling then, and its speed determines by following algebraic expression:

Velocity amplitude in the described process should satisfy following inequality:

$\frac{(T_{\mathrm{hot}}-T_{\mathrm{cold}})}{L_s}{V}_s>4,$

T wherein _HotBe the temperature of steel sheet or steel band when pressure rolling finishes, it is worth in 750 ℃～850 ℃ scope;

T _ColdBe the temperature of steel sheet or steel band when fast controlled chilling finishes, it is worth in 500 ℃～700 ℃ scope;

V _sBe described steel sheet or the steel band speed in sprinkler system or laminar flow, meter per second;

L _sBe sprinkler system or layer unitary length (can between 10～100 meters, change).

Satisfying under the condition of above component proportions, these inventions can provide the required strength characteristics (breaking tenacity reinforcement) of the steel-sheet that is up to 50 mm thick simultaneously, they are in ductility, weldability, resistance to cracking and the erosion resistance of sub-zero zero temperature.

Embodiment

Table 1 shows chemical composition of steel in two pipes, and one according to given composition manufacturing, and another is with different composition manufacturings.Choose composition by this way so that estimate that after pressure rolling molybdenum and nickel are to the influence of steel sheet intensity under different cooling conditionss.Melt processed is carried out in a vacuum induction furnace.The furnace charge of electric furnace comprises armco iron (technically pure iron) and also comprises nickel, ferromolybdenum, copper and other furnace charge according to heterogeneity.When in electric furnace, having reached required vacuum, the beginning melting batch.When thorough fusing and metal are heated to after 1630 ℃～1650 ℃, the furnace charge degassing, and in the molten bath, add manganese, ferrovanadium and the ferro-niobium of desired predetermined amount; Add reductor (ferrosilicon, aluminium and ferrotitanium) then.When the temperature of molten steel reached required level (1560 ℃～1580 ℃), airfree metal directly flow in the mold from smelting furnace.

Substantially, in vacuum induction furnace, carry out 12 heats test melting.The chemical ingredients of metal is all analyzed in each heat melting.Based on its result, select 3 heat meltings, wherein the ratio between the content of the total content of heat 1,2 and 3 nickel and manganese and molybdenum and phosphorus is respectively 0.01,0.0057 and 0.0064, promptly less than 0.03.

The steel ingot of selecting and the founding steel of specified tube are forged into 80～430 millimeters plate; Then they in reversing mill by pressure rolling to 50 and 20 mm thick.Afterwards, described plate is cooled off fast with the speed of per second 10 and 20 degree, and alternately cools off in open air.When current two Be Controlled were cooled off fast, the process of cooling of back was corresponding to the condition of hot-rolled steel sheet.The steel plate of Huo Deing is by moulding and be welded into pipe then.

Table 2 shows the characteristic of comparing these heats with the heat of principal component.The result who obtains demonstrates, the new steel of the mentioned component that (comprising with the cooling of the speed control of 4 ℃ of per seconds) makes according to the pressure rolling technology that provides have required over-all properties, for example good resistance to cracking and the ductility below the high strength of 50 millimeters cross section and high tenacity and the zero degree temperature that therefore has.The steel sheet channel speed of 10 meter per seconds in controlled chilling is to obtain on wide-strip mill.Steel-sheet surface temperature at the milling train end is 840 ℃; Surface of thin steel sheet temperature when the controlled chilling end of processing is 640 ℃; The length of stratiform machine (laminary machine) is 60 meters; The translational speed of steel band in laminar flow is 3 meter per seconds.The steel sheet channel speed of 20 meter per seconds in controlled chilling is to obtain on reversing mill.Steel-sheet surface temperature at the milling train end is 800 ℃; Surface of thin steel sheet temperature when the controlled chilling end of processing is 600 ℃; The length of quenching sprinkler system is 10 meters; The translational speed of steel band on described sprinkler system is 1 meter per second.Steel sheet air cooling speed approximately is 2～3 ℃/second.After cooling, steel sheet is made into tubulose and its edge is welded.

Table 2

Claims (2)

1. the pipe that is used for petroleum products, gas product and product conduit, this pipe is made by the steel of fused raw material casting initial or that purify, described steel comprise: carbon, manganese, silicon, chromium, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, antimony, tin, arsenic and iron, it is characterized in that described steel also comprise molybdenum, and have a following component proportions, weight %:

Carbon: 0.02～0.11

Manganese: 0.10～1.8

Silicon: 0.06～0.6

Chromium: 0.005～0.30

Nickel: 0.005～1.0

Vanadium: 0.01～0.12

Niobium: 0.02～0.1

Titanium: 0.01～0.04

Aluminium: 0.01～0.05

Calcium: 0.0005～0.008

Sulphur: 0.0005～0.008

Phosphorus: 0.001～0.012

Nitrogen: 0.001～0.012

Copper: 0.005～0.25

Antimony: 0.0001～0.005

Tin: 0.0001～0.007

Arsenic: 0.0001～0.008

Molybdenum: be no more than 0.5

Iron: remainder

In this case, by weight percentage, the inequality below the relation of the content of the total content of nickel and manganese and molybdenum and phosphorus satisfies:

$\frac{\mathrm{Ni}+\mathrm{Mn}}{1+\mathrm{Mo}}\&CenterDot;P<0.03.$

2. make the method for the pipe that is used for petroleum products, gas product and product conduit, comprise refining and make steel, ladle processing, steel cast, hot rolling, mold casting forming and welding with composition according to claim 1, it is characterized in that hot rolling implements on reversing mill or continuous rolling mill, carry out quick controlled chilling then, its speed determines by following algebraic expression:

Velocity amplitude in the described process should satisfy following inequality:

$\frac{(T_{\mathrm{hot}}-T_{\mathrm{cold}})}{L_s}{V}_s>4,$

T wherein _HotBe the temperature of steel sheet or steel band when pressure rolling finishes, it is worth in 750 ℃～850 ℃ scope;

T _ColdBe the temperature of steel sheet or steel band when fast controlled chilling finishes, it is worth in 500 ℃～700 ℃ scope;

V _sBe described steel sheet or the steel band speed in sprinkler system or laminar flow, meter per second;

L _sBe sprinkler system or the unitary length of layer, rice.